"use strict"
const path = require("path")

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = "ITG" // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 8066 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use "/" !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: "/",
  outputDir: "dist",
  assetsDir: "static",
  lintOnSave: process.env.NODE_ENV === "development",
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    }
  },
  css: {
    loaderOptions: {
      sass: {
        data: `@import "@/styles/variables.scss";`
      }
    }
  },
  configureWebpack: {
    // provide the app"s title in webpack"s name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        "@": resolve("src")
      }
    }
  },
  chainWebpack(config) {
    config.plugins.delete("preload") // TODO: need test
    config.plugins.delete("prefetch") // TODO: need test

    // set svg-sprite-loader
    config.module
      .rule("svg")
      .exclude.add(resolve("src/icons"))
      .end()
    config.module
      .rule("icons")
      .test(/\.svg$/)
      .include.add(resolve("src/icons"))
      .end()
      .use("svg-sprite-loader")
      .loader("svg-sprite-loader")
      .options({
        symbolId: "icon-[name]"
      })
      .end()

    // set preserveWhitespace
    config.module
      .rule("vue")
      .use("vue-loader")
      .loader("vue-loader")
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true
        return options
      })
      .end()

    config
    // https://webpack.js.org/configuration/devtool/#development
      .when(process.env.NODE_ENV === "development",
        config => config.devtool("cheap-source-map")
      )

    config
      .when(process.env.NODE_ENV !== "development",
        config => {
          config
            .plugin("ScriptExtHtmlWebpackPlugin")
            .after("html")
            .use("script-ext-html-webpack-plugin", [{
            // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: "all",
              cacheGroups: {
                libs: {
                  name: "chunk-libs",
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: "initial" // only package third parties that are initially dependent
                },
                elementUI: {
                  name: "chunk-elementUI", // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: "chunk-commons",
                  test: resolve("src/components"), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          config.optimization.runtimeChunk("single")
        }
      )
  }
}
